RDHx
ATR-60 Rear Door Heat Exchanger
Passive rear door heat exchanger for AI and high-density compute racks.
Apex Thermal engineers RDHx rear door heat exchangers and CDU coolant distribution units that remove up to 100 kW per rack — enabling AI, HPC, and hyperscale deployments without compromise.
Modern AI servers now draw 10–15 kW per rack, with GPU-dense clusters exceeding 60 kW. Traditional raised-floor air cooling cannot maintain safe operating temperatures, forcing operators to under-populate racks or over-provision CRAC/CRAH capacity.
Apex Thermal's liquid cooling solutions capture heat at the source, reduce PUE, and allow you to deploy more compute in the same footprint.
How It Works
Rear door heat exchangers and coolant distribution units engineered for the AI era.
Passive rear door heat exchanger for AI and high-density compute racks.
Engineered performance that transforms data center economics.
Reduce facility PUE by eliminating fan energy and raising supply water temperatures.
Support 30–100 kW per rack in the same cabinet footprint.
Cut cooling OPEX by 30–50% compared to traditional air systems.
Lower carbon intensity per compute watt and recover waste heat efficiently.
ATR-60 peak heat removal
ATR-100 peak heat removal
CDU-500 capacity
CDU-1500 capacity
Cooling architectures designed for the way you deploy compute.
Liquid cooling purpose-built for GPU-dense AI training and inference clusters.
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Modular, scalable cooling for multi-megawatt cloud deployments.
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Increase tenant density and reduce OPEX in existing facilities.
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Reliable, efficient cooling that supports sustainability goals.
Learn more →Whitepapers, case studies, and datasheets to inform your cooling strategy.
Talk to an Apex Thermal engineer about RDHx and CDU sizing for your facility.
Talk to an Engineer